Caroline Wozniacki of Denmark prepares to serve to Kai-Lung Chang of Taiwan during their women's singles 2nd round match of the 2010 US Open at the USTA Billie Jean King National Tennis Center in New York. Wozniacki won 6-0, 6-0.

Mardy Fish of the United States reacts to a call during his match against Pablo Cuevas of Uruguay at the U.S. Open tennis tournament in New York, Thursday, Sept. 2, 2010. Fish won the match 7-5, 6-0, 6-2.

NEW YORK - SEPTEMBER 02: Novak Djokovic of Serbia celebrates defeating Philipp Petzschner Germany (not pictured) during day four of the 2010 U.S. Open at the USTA Billie Jean King National Tennis Center on September 2, 2010 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Matthew Stockman/Getty Images)

NEW YORK - SEPTEMBER 02: Novak Djokovic of Serbiam (L) shakes hands with Philipp Petzschner Germany after defeating him during day four of the 2010 U.S. Open at the USTA Billie Jean King National Tennis Center on September 2, 2010 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Matthew Stockman/Getty Images)

NEW YORK - SEPTEMBER 02: Philipp Petzschner Germany reacts to losing his match against Novak Djokovic of Serbia (not pictured) during day four of the 2010 U.S. Open at the USTA Billie Jean King National Tennis Center on September 2, 2010 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Matthew Stockman/Getty Images)

Novak Djokovic, of Serbia, celebrates his win over Philipp Petzschner, of Germany, at the U.S. Open tennis tournament in New York, Thursday, Sept. 2, 2010. Djokovic won 7-5, 6-3, 7-6 (6).

Serbian tennis player Novak Djokovic celebrates after winning against Germany's Philipp Petzschner, during their second round match at the 2010 US Open tennis tournament September 2, 2010, in New York. (Photo by Emmanuel Dunand/AFP/Getty Images)

NEW YORK - SEPTEMBER 02: Novak Djokovic of Serbia celebrates defeating Philipp Petzschner Germany (not pictured) during day four of the 2010 U.S. Open at the USTA Billie Jean King National Tennis Center on September 2, 2010 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Matthew Stockman/Getty Images)

NEW YORK - SEPTEMBER 02: Philipp Petzschner Germany reacts to losing his match against Novak Djokovic of Serbia (not pictured) during day four of the 2010 U.S. Open at the USTA Billie Jean King National Tennis Center on September 2, 2010 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Matthew Stockman/Getty Images)

NEW YORK - SEPTEMBER 02: Novak Djokovic of Serbia celebrates defeating Philipp Petzschner Germany (not pictured) during day four of the 2010 U.S. Open at the USTA Billie Jean King National Tennis Center on September 2, 2010 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Matthew Stockman/Getty Images)

Serbian tennis player Novak Djokovic returns a point to Germany Philipp Petzschner, during their second round match at the 2010 US Open tennis tournament September 2, 2010, in New York. (Photo by Emmanuel Dunand/AFP/Getty Images)

Serbian tennis player Novak Djokovic celebrates after winning against Germany Philipp Petzschner, during their second round match at the 2010 US Open tennis tournament September 2, 2010, in New York. (Photo by Emmanuel Dunand/AFP/Getty Images)

Serbian tennis player Novak Djokovic celebrates after winning against Germany Philipp Petzschner, during their second round match at the 2010 US Open tennis tournament September 2, 2010, in New York. (Photo by Emmanuel Dunand/AFP/Getty Images)

Serbian tennis player Novak Djokovic celebrates after winning against Germany Philipp Petzschner, during their second round match at the 2010 US Open tennis tournament September 2, 2010, in New York. (Photo by Emmanuel Dunand/AFP/Getty Images)

Serbian tennis player Novak Djokovic celebrates a point against Germany's Philipp Petzschner, during their second round match at the 2010 US Open tennis tournament September 2, 2010, in New York. (Photo by Emmanuel Dunand/AFP/Getty Images)

Serbian tennis player Novak Djokovic returns a point to Germany Philipp Petzschner, during their second round match at the 2010 US Open tennis tournament September 2, 2010, in New York. (Photo by Emmanuel Dunand/AFP/Getty Images)

Serbian tennis player Novak Djokovic returns a point to Germany Philipp Petzschner, during their second round match at the 2010 US Open tennis tournament September 2, 2010, in New York. (Photo by Emmanuel Dunand/AFP/Getty Images)

Serbian tennis player Novak Djokovic returns a point to Germany Philipp Petzschner, during their second round match at the 2010 US Open tennis tournament September 2, 2010, in New York. (Photo by Emmanuel Dunand/AFP/Getty Images)

Serbian tennis player Novak Djokovic returns a point to Germany Philipp Petzschner, during their second round match at the 2010 US Open tennis tournament September 2, 2010, in New York. (Photo by Emmanuel Dunand/AFP/Getty Images)

NEW YORK - SEPTEMBER 02: Philipp Petzschner Germany argues a call during his match against Novak Djokovic of Serbia (not pictured) during day four of the 2010 U.S. Open at the USTA Billie Jean King National Tennis Center on September 2, 2010 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Matthew Stockman/Getty Images)

NEW YORK - SEPTEMBER 02: Philipp Petzschner Germany returns a shot against Novak Djokovic of Serbia (not pictured) during day four of the 2010 U.S. Open at the USTA Billie Jean King National Tennis Center on September 2, 2010 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Matthew Stockman/Getty Images)

Serbian tennis player Novak Djokovic returns a point to Germany Philipp Petzschner, during their second round match at the 2010 US Open tennis tournament September 2, 2010, in New York. (Photo by Emmanuel Dunand/AFP/Getty Images)

Serbian tennis player Novak Djokovic returns a point to Germany Philipp Petzschner, during their second round match at the 2010 US Open tennis tournament September 2, 2010, in New York. (Photo by Emmanuel Dunand/AFP/Getty Images)

Serbian tennis player Novak Djokovic returns a point to Germany Philipp Petzschner, during their second round match at the 2010 US Open tennis tournament September 2, 2010, in New York. (Photo by Emmanuel Dunand/AFP/Getty Images)

Serbian tennis player Novak Djokovic returns a point to Germany Philipp Petzschner, during their second round match at the 2010 US Open tennis tournament September 2, 2010, in New York. (Photo by Emmanuel Dunand/AFP/Getty Images)

NEW YORK - SEPTEMBER 02: Iveta Benesova of the Czech Republic reacts to losing a point to Maria Sharapova of Russia (not pictured) during day four of the 2010 U.S. Open at the USTA Billie Jean King National Tennis Center on September 2, 2010 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Matthew Stockman/Getty Images)

NEW YORK - SEPTEMBER 02: Philipp Petzschner Germany returns a shot against Novak Djokovic of Serbia (not pictured) during day four of the 2010 U.S. Open at the USTA Billie Jean King National Tennis Center on September 2, 2010 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Matthew Stockman/Getty Images)

NEW YORK - SEPTEMBER 02: Philipp Petzschner Germany returns a shot against Novak Djokovic of Serbia (not pictured) during day four of the 2010 U.S. Open at the USTA Billie Jean King National Tennis Center on September 2, 2010 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Chris McGrath/Getty Images)

NEW YORK - SEPTEMBER 02: Novak Djokovic of Serbia celebrates a point against Philipp Petzschner Germany (not pictured) during day four of the 2010 U.S. Open at the USTA Billie Jean King National Tennis Center on September 2, 2010 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Matthew Stockman/Getty Images)

NEW YORK - SEPTEMBER 02: Novak Djokovic of Serbia celebrates a point against Philipp Petzschner Germany (not pictured) during day four of the 2010 U.S. Open at the USTA Billie Jean King National Tennis Center on September 2, 2010 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Chris McGrath/Getty Images)

NEW YORK - SEPTEMBER 02: Novak Djokovic of Serbia celebrates a point against Philipp Petzschner Germany (not pictured) during day four of the 2010 U.S. Open at the USTA Billie Jean King National Tennis Center on September 2, 2010 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Matthew Stockman/Getty Images)

Serbian tennis player Novak Djokovic returns a point to Germany Philipp Petzschner, during their second round match at the 2010 US Open tennis tournament September 2, 2010, in New York. (Photo by Emmanuel Dunand/AFP/Getty Images)

Serbian tennis player Novak Djokovic returns a point to Germany Philipp Petzschner, during their second round match at the 2010 US Open tennis tournament September 2, 2010, in New York. (Photo by Emmanuel Dunand/AFP/Getty Images)

Serbian tennis player Novak Djokovic returns a point to Germany Philipp Petzschner, during their second round match at the 2010 US Open tennis tournament September 2, 2010, in New York. (Photo by Emmanuel Dunand/AFP/Getty Images)

Serbian tennis player Novak Djokovic serves a point to Germany Philipp Petzschner, during their second round match at the 2010 US Open tennis tournament September 2, 2010, in New York. (Photo by Emmanuel Dunand/AFP/Getty Images)

Serbian tennis player Novak Djokovic returns a point to Germany Philipp Petzschner, during their second round match at the 2010 US Open tennis tournament September 2, 2010, in New York. (Photo by Emmanuel Dunand/AFP/Getty Images)

Serbian tennis player Novak Djokovic celebrates after winning the first set against Germany Philipp Petzschner, during their second round match at the 2010 US Open tennis tournament September 2, 2010, in New York. (Photo by Emmanuel Dunand/AFP/Getty Images)

Serbian tennis player Novak Djokovic celebrates after winning the first set against Germany Philipp Petzschner, during their second round match at the 2010 US Open tennis tournament September 2, 2010, in New York. (Photo by Emmanuel Dunand/AFP/Getty Images)

Russian tennis player Maria Sharapova celebrates after winning against Czech player Iveta Benesova, during their second round match at the 2010 US Open tennis tournament September 2, 2010, in New York. Sharapova won 6-1, 6-2. (Photo by Emmanuel Dunand/AFP/Getty Images)

Serbian tennis player Novak Djokovic returns a point to Germany Philipp Petzschner, during their second round match at the 2010 US Open tennis tournament September 2, 2010, in New York. (Photo by Emmanuel Dunand/AFP/Getty Images)

Serbian tennis player Novak Djokovic returns a point to Germany Philipp Petzschner, during their second round match at the 2010 US Open tennis tournament September 2, 2010, in New York. (Photo by Emmanuel Dunand/AFP/Getty Images)

Russian tennis player Maria Sharapova celebrates after winning against Czech player Iveta Benesova, during their second round match at the 2010 US Open tennis tournament September 2, 2010, in New York. Sharapova won 6-1, 6-2. (Photo by Emmanuel Dunand/AFP/Getty Images)

Serbian tennis player Novak Djokovic celebrates after winning the first set against Germany Philipp Petzschner, during their second round match at the 2010 US Open tennis tournament September 2, 2010, in New York. (Photo by Emmanuel Dunand/AFP/Getty Images)

NEW YORK - SEPTEMBER 02: Novak Djokovic of Serbia celebrates a point against Philipp Petzschner Germany (not pictured) during day four of the 2010 U.S. Open at the USTA Billie Jean King National Tennis Center on September 2, 2010 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Matthew Stockman/Getty Images)

NEW YORK - SEPTEMBER 02: Novak Djokovic of Serbia celebrates a point against Philipp Petzschner Germany (not pictured) during day four of the 2010 U.S. Open at the USTA Billie Jean King National Tennis Center on September 2, 2010 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Matthew Stockman/Getty Images)

Maria Sharapova, pictured, has kept alive her hopes of a second US Open crown, four years after her first, with an impressive 6-1, 6-2 win over Iveta Benesova of the Czech Republic.

NEW YORK - SEPTEMBER 02: Novak Djokovic of Serbia reacts to losing a point against Philipp Petzschner Germany (not pictured) during day four of the 2010 U.S. Open at the USTA Billie Jean King National Tennis Center on September 2, 2010 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Matthew Stockman/Getty Images)

NEW YORK - SEPTEMBER 02: Novak Djokovic of Serbia reacts to losing a point against Philipp Petzschner Germany (not pictured) during day four of the 2010 U.S. Open at the USTA Billie Jean King National Tennis Center on September 2, 2010 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Matthew Stockman/Getty Images)

NEW YORK - SEPTEMBER 02: Novak Djokovic of Serbia reacts to losing a point against Philipp Petzschner Germany (not pictured) during day four of the 2010 U.S. Open at the USTA Billie Jean King National Tennis Center on September 2, 2010 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Matthew Stockman/Getty Images)

NEW YORK - SEPTEMBER 02: Novak Djokovic of Serbia reacts to losing a point against Philipp Petzschner Germany (not pictured) during day four of the 2010 U.S. Open at the USTA Billie Jean King National Tennis Center on September 2, 2010 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Matthew Stockman/Getty Images)

Dominika Cibulkova of Slovakia returns a shot to Kateryna Bondarenko of the Ukraine at the U.S. Open tennis tournament in New York, Thursday, Sept. 2, 2010. Cibulkova won the match 6-2, 5-7, 7-6(7).

NEW YORK - SEPTEMBER 02: Novak Djokovic of Serbia returns a shot against Philipp Petzschner Germany (not pictured) during day four of the 2010 U.S. Open at the USTA Billie Jean King National Tennis Center on September 2, 2010 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Matthew Stockman/Getty Images)

NEW YORK - SEPTEMBER 02: Maria Sharapova of Russia celebrates defeating Iveta Benesova of the Czech Republic (not pictured) during day four of the 2010 U.S. Open at the USTA Billie Jean King National Tennis Center on September 2, 2010 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Matthew Stockman/Getty Images)

NEW YORK - SEPTEMBER 02: Maria Sharapova of Russia celebrates defeating Iveta Benesova of the Czech Republic (not pictured) during day four of the 2010 U.S. Open at the USTA Billie Jean King National Tennis Center on September 2, 2010 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Chris McGrath/Getty Images)

NEW YORK - SEPTEMBER 02: Maria Sharapova of Russia returns a shot against Iveta Benesova of the Czech Republic (not pictured) during day four of the 2010 U.S. Open at the USTA Billie Jean King National Tennis Center on September 2, 2010 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Chris McGrath/Getty Images)

NEW YORK - SEPTEMBER 02: Maria Sharapova of Russia celebrates defeating Iveta Benesova of the Czech Republic (not pictured) during day four of the 2010 U.S. Open at the USTA Billie Jean King National Tennis Center on September 2, 2010 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Matthew Stockman/Getty Images)

NEW YORK - SEPTEMBER 02: Maria Sharapova of Russia returns a shot against Iveta Benesova of the Czech Republic (not pictured) during day four of the 2010 U.S. Open at the USTA Billie Jean King National Tennis Center on September 2, 2010 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Chris McGrath/Getty Images)

NEW YORK - SEPTEMBER 02: Maria Sharapova of Russia returns a shot against Iveta Benesova of the Czech Republic (not pictured) during day four of the 2010 U.S. Open at the USTA Billie Jean King National Tennis Center on September 2, 2010 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Chris McGrath/Getty Images)

NEW YORK - SEPTEMBER 02: Maria Sharapova of Russia celebrates defeating Iveta Benesova of the Czech Republic (not pictured) during day four of the 2010 U.S. Open at the USTA Billie Jean King National Tennis Center on September 2, 2010 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Matthew Stockman/Getty Images)

NEW YORK - SEPTEMBER 02: Maria Sharapova of Russia celebrates defeating Iveta Benesova of the Czech Republic (not pictured) during day four of the 2010 U.S. Open at the USTA Billie Jean King National Tennis Center on September 2, 2010 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Matthew Stockman/Getty Images)

NEW YORK - SEPTEMBER 02: Maria Sharapova of Russia celebrates defeating Iveta Benesova of the Czech Republic (not pictured) during day four of the 2010 U.S. Open at the USTA Billie Jean King National Tennis Center on September 2, 2010 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Matthew Stockman/Getty Images)

Russian tennis player Maria Sharapova returns a point to Czech player Iveta Benesova, during their second round match at the 2010 US Open tennis tournament September 2, 2010, in New York. (Photo by Emmanuel Dunand/AFP/Getty Images)

Russian tennis player Maria Sharapova celebrates after winning against Czech player Iveta Benesova, during their second round match at the 2010 US Open tennis tournament September 2, 2010, in New York. Sharapova won 6-1, 6-2. (Photo by Emmanuel Dunand/AFP/Getty Images)

Russian tennis player Maria Sharapova returns a point to Czech player Iveta Benesova, during their second round match at the 2010 US Open tennis tournament September 2, 2010, in New York. (Photo by Emmanuel Dunand/AFP/Getty Images)

Russian tennis player Maria Sharapova celebrates after winning against Czech player Iveta Benesova, during their second round match at the 2010 US Open tennis tournament September 2, 2010, in New York. Sharapova won 6-1, 6-2. (Photo by Emmanuel Dunand/AFP/Getty Images)

Russian tennis player Maria Sharapova celebrates after winning against Czech player Iveta Benesova, during their second round match at the 2010 US Open tennis tournament September 2, 2010, in New York. Sharapova won 6-1, 6-2. (Photo by Emmanuel Dunand/AFP/Getty Images)

Russian tennis player Maria Sharapova returns a point to Czech player Iveta Benesova, during their second round match at the 2010 US Open tennis tournament September 2, 2010, in New York. (Photo by Emmanuel Dunand/AFP/Getty Images)

Russian tennis player Maria Sharapova returns a point to Czech player Iveta Benesova, during their second round match at the 2010 US Open tennis tournament September 2, 2010, in New York. (Photo by Emmanuel Dunand/AFP/Getty Images)

Russian tennis player Maria Sharapova serves a point to Czech player Iveta Benesova, during their second round match at the 2010 US Open tennis tournament September 2, 2010, in New York. (Photo by Emmanuel Dunand/AFP/Getty Images)

Russian tennis player Maria Sharapova returns a point to Czech player Iveta Benesova, during their second round match at the 2010 US Open tennis tournament September 2, 2010, in New York. (Photo by Emmanuel Dunand/AFP/Getty Images)

NEW YORK - SEPTEMBER 02: Iveta Benesova of the Czech Republic serves to Maria Sharapova of Russia (not pictured) during day four of the 2010 U.S. Open at the USTA Billie Jean King National Tennis Center on September 2, 2010 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Chris McGrath/Getty Images)

NEW YORK - SEPTEMBER 02: Iveta Benesova of the Czech Republic serves to Maria Sharapova of Russia (not pictured) during day four of the 2010 U.S. Open at the USTA Billie Jean King National Tennis Center on September 2, 2010 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Chris McGrath/Getty Images)

NEW YORK - SEPTEMBER 02: Maria Sharapova of Russia celebrates against Iveta Benesova of the Czech Republic (not pictured) during day four of the 2010 U.S. Open at the USTA Billie Jean King National Tennis Center on September 2, 2010 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Matthew Stockman/Getty Images)

NEW YORK - SEPTEMBER 02: Maria Sharapova of Russia celebrates against Iveta Benesova of the Czech Republic (not pictured) during day four of the 2010 U.S. Open at the USTA Billie Jean King National Tennis Center on September 2, 2010 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Matthew Stockman/Getty Images)

NEW YORK - SEPTEMBER 02: Maria Sharapova of Russia returns a shot against Iveta Benesova of the Czech Republic (not pictured) during day four of the 2010 U.S. Open at the USTA Billie Jean King National Tennis Center on September 2, 2010 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Matthew Stockman/Getty Images)

Russian tennis player Maria Sharapova reacts after winning the first set against Czech player Iveta Benesova, during their second round match at the 2010 US Open tennis tournament September 2, 2010, in New York. (Photo by Emmanuel Dunand/AFP/Getty Images)

NEW YORK - SEPTEMBER 02: Maria Sharapova of Russia returns a shot against Iveta Benesova of the Czech Republic (not pictured) during day four of the 2010 U.S. Open at the USTA Billie Jean King National Tennis Center on September 2, 2010 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Matthew Stockman/Getty Images)

Russian tennis player Maria Sharapova returns a point to Czech player Iveta Benesova, during their second round match at the 2010 US Open tennis tournament September 2, 2010, in New York. (Photo by Emmanuel Dunand/AFP/Getty Images)

Russian tennis player Maria Sharapova returns a point to Czech player Iveta Benesova, during their second round match at the 2010 US Open tennis tournament September 2, 2010, in New York. (Photo by Emmanuel Dunand/AFP/Getty Images)

Russian tennis player Maria Sharapova returns a point to Czech player Iveta Benesova, during their second round match at the 2010 US Open tennis tournament September 2, 2010, in New York. (Photo by Emmanuel Dunand/AFP/Getty Images)

Russian tennis player Maria Sharapova returns a point to Czech player Iveta Benesova, during their second round match at the 2010 US Open tennis tournament September 2, 2010, in New York. (Photo by Emmanuel Dunand/AFP/Getty Images)

Russian tennis player Maria Sharapova returns a point to Czech player Iveta Benesova, during their second round match at the 2010 US Open tennis tournament September 2, 2010, in New York. (Photo by Emmanuel Dunand/AFP/Getty Images)

Russian tennis player Maria Sharapova reacts after winning the first set against Czech player Iveta Benesova, during their second round match at the 2010 US Open tennis tournament September 2, 2010, in New York. (Photo by Emmanuel Dunand/AFP/Getty Images)

Russian tennis player Maria Sharapova serves a point to Czech player Iveta Benesova, during their second round match at the 2010 US Open tennis tournament September 2, 2010, in New York. (Photo by Emmanuel Dunand/AFP/Getty Images)

NEW YORK - SEPTEMBER 02: Maria Sharapova of Russia returns a shot against Iveta Benesova of the Czech Republic (not pictured) during day four of the 2010 U.S. Open at the USTA Billie Jean King National Tennis Center on September 2, 2010 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Matthew Stockman/Getty Images)

NEW YORK - SEPTEMBER 02: Iveta Benesova of the Czech Republic returns a shot to Maria Sharapova of Russia (not pictured) during day four of the 2010 U.S. Open at the USTA Billie Jean King National Tennis Center on September 2, 2010 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Matthew Stockman/Getty Images)

NEW YORK - SEPTEMBER 02: Maria Sharapova of Russia returns a shot against Iveta Benesova of the Czech Republic (not pictured) during day four of the 2010 U.S. Open at the USTA Billie Jean King National Tennis Center on September 2, 2010 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Matthew Stockman/Getty Images)

NEW YORK - SEPTEMBER 02: Maria Sharapova of Russia returns a shot against Iveta Benesova of the Czech Republic (not pictured) during day four of the 2010 U.S. Open at the USTA Billie Jean King National Tennis Center on September 2, 2010 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Matthew Stockman/Getty Images)

NEW YORK - SEPTEMBER 02: Peter Polansky of Canada serves against James Blake of the United States during his men's singles match on day four of the 2010 U.S. Open at the USTA Billie Jean King National Tennis Center on September 2, 2010 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Michael Heiman/Getty Images)

NEW YORK - SEPTEMBER 02: Maria Sharapova of Russia serves against Iveta Benesova of the Czech Republic (not pictured) during day four of the 2010 U.S. Open at the USTA Billie Jean King National Tennis Center on September 2, 2010 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Matthew Stockman/Getty Images)

NEW YORK - SEPTEMBER 02: Maria Sharapova of Russia returns a shot against Iveta Benesova of the Czech Republic (not pictured) during day four of the 2010 U.S. Open at the USTA Billie Jean King National Tennis Center on September 2, 2010 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Matthew Stockman/Getty Images)

Russian tennis player Maria Sharapova serves a point to Czech player Iveta Benesova, during their second round match at the 2010 US Open tennis tournament September 2, 2010, in New York. (Photo by Emmanuel Dunand/AFP/Getty Images)

Russian tennis player Maria Sharapova serves a point to Czech player Iveta Benesova, during their second round match at the 2010 US Open tennis tournament September 2, 2010, in New York. (Photo by Emmanuel Dunand/AFP/Getty Images)

Russian tennis player Maria Sharapova serves a point to Czech player Iveta Benesova, during their second round match at the 2010 US Open tennis tournament September 2, 2010, in New York. (Photo by Emmanuel Dunand/AFP/Getty Images)

Russian tennis player Maria Sharapova returns a point to Czech player Iveta Benesova, during their second round match at the 2010 US Open tennis tournament September 2, 2010, in New York. (Photo by Emmanuel Dunand/AFP/Getty Images)

Russian tennis player Maria Sharapova returns a point to Czech player Iveta Benesova, during their second round match at the 2010 US Open tennis tournament September 2, 2010, in New York. (Photo by Emmanuel Dunand/AFP/Getty Images)

Russian tennis player Maria Sharapova returns a point to Czech player Iveta Benesova, during their second round match at the 2010 US Open tennis tournament September 2, 2010, in New York. (Photo by Emmanuel Dunand/AFP/Getty Images)

Russian tennis player Maria Sharapova returns a point to Czech player Iveta Benesova, during their second round match at the 2010 US Open tennis tournament September 2, 2010, in New York. (Photo by Emmanuel Dunand/AFP/Getty Images)

Bethanie Mattek-Sands of the US returns a shot to Andrea Petkovic of Germany at the US Open 2010 tennis tournament September 2, 2010 in New York. (Photo by Stan Honda/AFP/Getty Images)